What under-camera batteries are available?
 

Im looking for an under camera battery which attaches to the 1/4" tripod mount and then has a similar connection on the bottom of the battery to connect to the tripod.

Preferably it has a 4-pin XLR connector.

I know AB has an Elipz under-camera battery, but I believe it only has a proprietary connector.

Any ideas?

Edit: Forgot to mention 12V for running lights. The Elipz is 7.2 volt and made for running the camera and their light.